气候变化领域集成服务门户(CCPortal): MAVEN SEP Observations of Scorpius X-1 X-Rays at Mars: A Midatmosphere Occultation Analysis Technique

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DOI	10.1029/2020GL088927
	MAVEN SEP Observations of Scorpius X-1 X-Rays at Mars: A Midatmosphere Occultation Analysis Technique
	Rahmati A.; Larson D.E.; Cravens T.E.; Lillis R.J.; Lee C.O.; Dunn P.A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:21
英文摘要	We report on the first observations of atmospheric occultations at Mars of ~10 keV X-rays from an extrasolar source identified as Scorpius X-1. The measurements are taken by the SEP (Solar Energetic Particle) instrument on the MAVEN (Mars Atmosphere and Volatile EvolutioN) spacecraft. The detected X-ray photons from Scorpius X-1 penetrate the Martian atmosphere down to ~70 km altitude, before being attenuated by the neutrals in the atmosphere. The occultation altitude varies by a few km depending on the source X-ray energy and the atmospheric neutral density. In this work, we study the detection response of SEP to Scorpius X-1 X-rays and demonstrate that X-ray occultation data can be used in conjunction with a model of the light extinction curve in order to gain insights into the neutral density of the Mars atmosphere in the 50–100 km altitude range, an important and largely unexplored altitude range at Mars. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Light extinction; Analysis techniques; Atmospheric occultations; Mars atmosphere; Martian atmospheres; Neutral densities; Solar energetic particles; Volatile evolution; X-ray energies; X rays; altitude; Mars; Martian atmosphere; observational method; spacecraft; X-ray
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169499
作者单位	Space Sciences Laboratory, University of California, Berkeley, CA, United States; Department of Physics and Astronomy, University of Kansas, Lawrence, KS, United States
推荐引用方式 GB/T 7714	Rahmati A.,Larson D.E.,Cravens T.E.,et al. MAVEN SEP Observations of Scorpius X-1 X-Rays at Mars: A Midatmosphere Occultation Analysis Technique[J],2020,47(21).
APA	Rahmati A.,Larson D.E.,Cravens T.E.,Lillis R.J.,Lee C.O.,&Dunn P.A..(2020).MAVEN SEP Observations of Scorpius X-1 X-Rays at Mars: A Midatmosphere Occultation Analysis Technique.Geophysical Research Letters,47(21).
MLA	Rahmati A.,et al."MAVEN SEP Observations of Scorpius X-1 X-Rays at Mars: A Midatmosphere Occultation Analysis Technique".Geophysical Research Letters 47.21(2020).